How can I mount line on image so that computer can track it?

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angle measurment
I tracked this tutorial and faced problem.
In my case, image I want to analyze has unstable horizontal boundary.
That makes computer hard to track horizontal boundary and data gone inexact.
So I drew line on image and let the computer track boundary but computer couldnt.
How can I make straight line that computer can track?
  4 Kommentare
Walter Roberson
Walter Roberson am 31 Jan. 2017
Using line() draws on the screen; it does not change what is stored in the variable img .
If you have the Computer Vision toolbox you can use https://www.mathworks.com/help/vision/ref/vision.shapeinserter-class.html
hyong suk choo
hyong suk choo am 31 Jan. 2017
Thank you! I will try it!

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Tohru Kikawada
Tohru Kikawada am 27 Jan. 2017
Try to detect lines with houghlines as follows:
It could be applied for imbalanced boundary images.

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